Drill



(No Mocel'.) v

D. BAKER.

DRILL.

No. 488,050. Paten-ted Deo. 13, 1892.

i' fm 'III/11111100) Z ATTORNEY TATES UNiTE DAVID BAKER, OF SPARROWS POINT, MARYLAND.

DRILL.

SIPECIFIGATION forming part of Letters Patent No. 488,050, dated December 13, 1892. Application ned .rune 21, 1892. serial No. 437,493. nro man.)

To all whom, it may concern,.-

Be it known that I, DAVID BAKER, of Sparrows Point, Maryland, have invented certain new and useful Improvements in Drills for Tapping Blast Furnaces and Like Uses, of which the following is a description, reference being taken to the accompanying drawings, which form part of this specification.

It has heretofore been customary in using drills to open the tapping-holes of blast-furnaces to feed the drill forward by means of a hand-screw or like device. This necessarily consumes much time, and is therefore in many cases a serious inconvenience.

The purpose of my invention is to produce a quickly-operated and readily-controllable drill which may at once be simple in its operation, effective, and quick in action.

To these ends it consists of the new method of operating and is embodied in the apparatusv and the Several features thereof constructed, arranged, combined, and used substantially as and for the purposes hereinafter described, illustrated, and claimed.

In the accompanying drawings, Figure lis a plan view of my invention partly in section to show construction. Fig. 2 is a detail of a clamp by which I retain mydrill at any position and prevent its being fed forward. Figs. 3 and 4 are details of my controlling-valve.

In the several gures like letters of reference indicate like parts.

In constructing 'and operating a drill according to my invention I mount the drill on sliding or swinging frame, so that it may readily be pushed or swung up and so removed from the tap-hole. The frame is also angularly adjustable, so that the hole may be drilled at the proper angle. The weight of the frame with the drill and its attachments is counterbalanced at each end by weights and chains or in any other suitable manner, so that it may be more readily moved into or out of operative position. The drill, which may be of the Rand or any other suitable type, travels upon suitable slides on the frame, so that it can be fed forward or backward. Instead of advancing and withdrawing the drill by a hand-screw or other feed, I secure to the rear of the drill a tubular rod, which forms at once the piston-rod of a cylinder for feedthe cylinder, and thereby withdraw the drill from the taphole, or may be exhausted to permit the reverse motion'. At lthe other end of the cylinder is another port connected either with the supplypipe or an exhaustpipe by another three-way cock. Owing to the relative size of piston and piston-rod, a much greater effective surface is had upon the rear end of the piston than upon the annular portion of its front face. When,there fore, both three-Way cocks are open to admit pressure to both ends of the feed-cylinder, the pistou is driven forward by the `difference of pressure and feeds the drill toward the tap hole, or the cock for the front end of the pislton may be set at exhaust and greater pressure obtained. To control this feed, I place a friction-clamp in a position to grip the exposed portion of the tubular piston-rod. By tightening this clamp I may regulate or stop the feed. The drill is supplied with steam or air through the hollow piston-rod which connects with the front or rear 0f the piston. I prefer the latter construction, as by it certain advantages are had, and therefore I Will describe the latter type of my invention. When steam or air isadmitted to the rear of the piston, it

' passes through the hollow tubular piston and piston-rod into the drill, setting it in operation. When, on the other hand, the rear cock is turned to shut off the admission of steam from the rear of the cylinder and to open the ex-A haust, the drillis quickly withdrawn from the tap-hole by the unbalanced pressure upon the annular front face of the feed-piston. It is therefore possible by my invention to feed, withdraw, and control my drill. with great ease and rapidity by the mere adjustment of one three-way cock with the aid, if necessary, of the friction-clamp.

I do not limit myself to the use of threeway cocks or any particular means for controlling the admission and exhaust. Other ways, though perhaps not so simple, may be IOO employed, and if the drills have a separate supply-valve that may be used 'to assist in regulating the speed.

In the foregoing sections I have set forth the gener-al nat-ure of myinvention, and now, referring to the drawings, I will describe one embodiment of it.

At B is indicated the tap-hole of the furnace. At C is shown the horizontal supporting-rod or cross-bar for the carriage of my drill, arranged to slide vertically upon guides D, secured to the columns E. The frame upon which my drill and feeding apparatus are mounted consists of two parallel angle-irons F, eight or ten inches apart and pivotally supported at one end on the cross-bar C. The drill itself, of the Rand, Ingersol, or other suitable type, is shown at G, mounted upon slides g at the front of the frame. At the rear of the drill is shown the feed-cylinder H, which may be made of heavy five -inch Wrought-iron or drawn-brass piping provided with suitable heads. At each end of the cylinder are steam-ports h, connected with the supply-pipe. The supply-pipe may be run down one column or in any other suitable manner. In the branch pipe which connects with the port at the rear end of the cylinder is a threeway cock J and exhaust-pipe j, so arranged that the admission of steam or air to the port may be cut off and the exhaust opened. In Fig. 3 is shown the position for the exhaustvalve, and in Fig. et its position for admission. In the branch pipe which connects with the front of the cylinder is a similar threeway cock and exhaust-pipe N. Within the feed-cylinder is the piston K, axially cored to receive the hollow piston-rod L. The pistonrod is preferably ofinch-and-a-half doubleextra-heavypipe and runs through the piston to its rear face. rlhe other' end of the piston-rod projects through a suitable packing-box in the cylinder-head and is secured to the rear of the drill in a manner similar to the ordinary feed-screw. A short pipel from the steam-chest of the drill to a T on the tubular piston-rod L, as shown, connects the steam-chest of the drill directly with the rear end of the feed-cylinder I-I. At a suitable point between the operating-cylinder G and the feed-cylinderH,Iplacea hand-clamp M, which grips the tubular piston-rod, and thereby regulates the feeding of the drill or clamps it in a fixed position. A detail of this clamp is shown in Fig. 2,though any desirable form of hand-clamp may be used.

The operation of my drill is as follows: When not in use, it is pushed up out-of the way. To enable the operator readily to raise and lower it, of course it is suitably counterbalanced, preferably at each end separately, so that either end may be raised or lowered independently of the other. rIo bring it into use, it is drawn down and clamped opposite the tapping-hole, the cross-bar C sliding down the guides D. The rear end ofthe frame may then be tilted up or down to give the proper angle for boring. Steam or air being turned on, the valve J set for exhaust, and the valve N for admission, the drill is at the rear end of its travel. The cock J is now set to admit pressure to the rear end of the feed-cylinder and the difference between the total pressure upon the rear of the piston and that upon the front face drives it forward and advances the drill. At the same time the steam or compressed air forces its way from the rear of the feed-cylinder through the tu bular piston-rod and connection Z into the operating-cylinder of the drill and starts the drill. The feed may be regulated or stopped by the hand-wheel M, and the speed of the drilling by the drill-valve or by the threeway cocks. The drill may be stopped and withdrawn simultaneously by merely turning the three-way cock J and relieving the pressure from the rear of the feed-cylinder, causing the piston to be driven back by the unbalanced pressure in front of it. The whole apparatus may then be shoved up out of the Way and the operation is complete.

I have now set forth my invention and the manner in which it may be used, and therefore, without limiting myself to the details shown and desiring to secure by these Letters Patent the many immaterial modifications which may be made in the construction of parts and which may readily suggest themselves to the skilled mechanic, I claim as my own, and desire to secure by these Letters Patent, the following:

l. In combination, for the purposes described, a feed-cylinder, piston, and pistonrod, a drill traveling with the said pistonrod, admission and exhaust ports for the said cylinder, and a Valve therefor, substantially as set forth.

2. In combination, for the purposes described, a feed-cylinder, piston, and tubular piston-rod, a frame therefor, connections for admitting fluid-pressure to the said cylinder, a drill mounted upon the saidframe and secured to the said piston-rod, a fluid connection between the said tubular piston-rod and the said drill, and means for controlling the Huid-pressure upon the said piston, substantially as set forth.

In testimony whereof I have hereto set my hand this 17th day of June, 1892.

DAVID BAKER.

l/Vitnesses:

FELIX R. SULLIVAN, HEBER H. STRYKER.

IOS 

